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我正在做一个项目，其中我需要两个带有缩放选项的单一布局的图像视图。AFAIK android 允许一个视图轻松进行缩放。但我的问题不是这样的。我有两个图像视图一个接一个。我尝试在框架布局中做到这一点。但结果并不是那么好。当图像超出布局范围并且缩放不那么平滑时，图像会缩小。我尝试使用已弃用的绝对布局来做到这一点。但它不起作用欢迎所有建议。

我的代码在这里

  int x = (int)event.getRawX();
     int y = (int)event.getRawY();
         ImageView view = (ImageView) v;

         switch (event.getAction() & MotionEvent.ACTION_MASK) {
          case MotionEvent.ACTION_DOWN:
             savedMatrix.set(matrix);
             start.set(event.getX(), event.getY());

             mode = DRAG;
           hoffset = x - v.getLeft();
       voffset = y - v.getTop();
             break;
          case MotionEvent.ACTION_POINTER_DOWN:
             oldDist = spacing(event);
             Log.d(TAG, "oldDist=" + oldDist);
             if (oldDist > 10f) {
                savedMatrix.set(matrix);
                midPoint(mid, event);
                mode = ZOOM;
                Log.d(TAG, "mode=ZOOM");
             }
             break;
          case MotionEvent.ACTION_UP:
            // moveView(v, x - hoffset, y - voffset);
          case MotionEvent.ACTION_POINTER_UP:
             mode = NONE;

             Log.d(TAG, "mode=NONE");
             break;
          case MotionEvent.ACTION_MOVE:
             if (mode == DRAG) {
                 moveView(v, x - hoffset, y - voffset);
                hrecent = x;
                vrecent = y;
             }
             else if (mode == ZOOM) {


                newDist = spacing(event);
                if (newDist > 10f) {

                   matrix.set(savedMatrix);

                   float scale = newDist / oldDist;
         matrix.postScale(ScaleFactorForZoom, ScaleFactorForZoom, mid.x, mid.y);



               float delta =10.0f+ (newDist -oldDist)/oldDist;
           // view.setImageMatrix(matrix);    
                 float newHeight;
                 float newWidth;


        newHeight=(float) ((delta)+view.getHeight());
        newWidth=(float) ((delta)+view.getWidth());

                    oldDist = newDist; 



                 zoomView(view, newWidth, newHeight);

                }
             }
             break;
          }



          return true; 
    }

MoveView 函数是

     public void moveView(View v, int x, int y)
       {
         ViewGroup.LayoutParams params = v.getLayoutParams();
         if (params instanceof FrameLayout.LayoutParams)
         {
           FrameLayout.LayoutParams par = (FrameLayout.LayoutParams)params;
          View parent = (View)(v.getParent());
           x = Math.min(x, parent.getWidth());
           x = Math.max(x, 0);
           y = Math.min(y, parent.getHeight());
           y = Math.max(y, 0);


          par.leftMargin=x;
          par.topMargin=y;
           v.setLayoutParams(par);
       }
   }

缩放功能在这里

public void zoomView(View v, float width, float height)
   {
       ViewGroup.LayoutParams params = v.getLayoutParams();
       if (params instanceof FrameLayout.LayoutParams)
       {
           FrameLayout.LayoutParams par = (FrameLayout.LayoutParams)params;
           par.width = (int)width;
           par.height = (int)height;

           v.setLayoutParams(par);


       }
   }
4

2 回答 2

0

我通过在 Frame Layout 上方放置两个图像视图并为 Frame Layout 编写触摸事件并放置两个按钮来选择要缩放的视图并为该图像设置矩阵来做到这一点

于 2011-12-15T04:47:23.133 回答
0

您不应该使用 par.width = (int) width ，因为小数部分总是默认被故障截断，而是使用 par.width = Math.round (Width) 并考虑有时恢复默认值的机制.

于 2014-05-05T13:36:00.053 回答